It is a nightmare using airpak!!
I too used 4px to ship my first taobao purchase (airpak to deliver in Malaysia by default). Got a text on we'd saying item will be delivered but I still have not received it (today is Friday). Tracked online it says "out for delivery" - 3 days Singapore also can reach lo. Called their office, forever line engaged. When finally got through, tell me same thing I can see from online tracker. When I raised my voice, then passed the line to "person in charged" that forever didn't answer. Called once everyday still no news about my parcel. God knows if I will ever receive my item. Totally pissed with airpak.